Forwarding POST body into renderer after a cross-site transfer.

content/browser/frame_host/navigator_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/navigator_impl.h"
 
 #include <utility>
 
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
@@ skipping 689 matching lines @@
 }
 
 void NavigatorImpl::RequestTransferURL(
     RenderFrameHostImpl* render_frame_host,
     const GURL& url,
     SiteInstance* source_site_instance,
     const std::vector<GURL>& redirect_chain,
     const Referrer& referrer,
     ui::PageTransition page_transition,
     const GlobalRequestID& transferred_global_request_id,
-    bool should_replace_current_entry) {
+    bool should_replace_current_entry,
+    const scoped_refptr<ResourceRequestBody>& resource_request_body) {
   // This call only makes sense for subframes if OOPIFs are possible.
   DCHECK(!render_frame_host->GetParent() ||
          SiteIsolationPolicy::AreCrossProcessFramesPossible());
 
   // Allow the delegate to cancel the transfer.
   if (!delegate_->ShouldTransferNavigation())
     return;
 
   GURL dest_url(url);
   Referrer referrer_to_use(referrer);
@@ skipping 84 matching lines @@
   // |entry| during NavigateToEntry.  This will go away when we shortcut this
   // further in https://crbug.com/536906.
   scoped_refptr<FrameNavigationEntry> frame_entry(entry->GetFrameEntry(node));
   if (!frame_entry) {
     // TODO(creis): Handle POST submissions here, as above.
     frame_entry = new FrameNavigationEntry(
         node->unique_name(), -1, -1, nullptr,
         static_cast<SiteInstanceImpl*>(source_site_instance), dest_url,
         referrer_to_use, "GET", -1);
   }
+
+  // TODO(lukasza): DO NOT SUBMIT: Plumb |resource_request_body| further.
+  // Option #1: Conjure a new page state and add the body into the page state?
+  // Option #2: Add the body to either FrameNav...Entry or NavigationEntryImpl.

[Łukasz Anforowicz, 2016/05/10 00:49:37]

I haven't quite wrapped my head yet around option #1 - this option seems most
compatible with clamy@'s PlzNavigate CL (where post data is being extracted from
PageState), but I don't know how to construct or mutate a PageState in order to
populate its POST body.

+
   NavigateToEntry(node, *frame_entry, *entry.get(),
                   NavigationController::NO_RELOAD, false, false);
 }
 
 // PlzNavigate
 void NavigatorImpl::OnBeforeUnloadACK(FrameTreeNode* frame_tree_node,
                                       bool proceed) {
   CHECK(IsBrowserSideNavigationEnabled());
   DCHECK(frame_tree_node);
 
@@ skipping 322 matching lines @@
   if (pending_entry != controller_->GetVisibleEntry() ||
       !should_preserve_entry) {
     controller_->DiscardPendingEntry(true);
 
     // Also force the UI to refresh.
     controller_->delegate()->NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
   }
 }
 
 }  // namespace content